Equipped with a 2.3-inch LCD screen, adjustable contrast, and white backlight with adjustable brightness, the image is large and clear. Equipped with a 3.5mm external CW key interface, it can support external direct keys (heavy keys), Bug keys, or automatic keys (single or double paddle). Equipped with a CW key indicator light, it can be used alone or disabled. During listening training, the code can be played with both sound and light, making the practice more intuitive. Equipped with amplifier chips and speakers, the sound is clear and the volume and tone can be adjusted. There is also a headphone jack that allows for silent practice with headphones, which feels better. Equipped with CW key output port, the key signal can be shared with other devices to achieve the function of a CW key with content display. The main functions include CW input practice, listening test, phrase query, character encoding query, etc. You can set the sound switch and tone, clap practice speed (wpm), listening test speed (wpm), key type, screen contrast, etc. Color: As Shown Material: ABS Package Contents: 1 set of Mini Morse Code Trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.